Head Nebula
Blown by fast winds from a hot, massive star,this cosmic bubble is huge.Cataloged asSharpless2-308 it lies some 5,000 light-years away toward the constellation ofthe Big Dog(CanisMajor) and covers slightly more of the sky than a Full Moon.Thatcorrespondsto a diameter of 60 light-years at its estimated distance.The massive star that created the bubble, aWolf-Rayet star,is the bright onenear the centerof the nebula.
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